| Popis: |
A growth curve is presented, that using the Tanner and Whitehouse's 50th centile, plots the height versus weight, both for males and females. The age is gives as parameter on the curves. In this way, weight, height and age are merged on a single chart for every sex. After exemplifying its advantages, the simpler relief of deviation from the values of the height-weight medians on the various ages, because the values of weight refer to the real height (and back), not to the age. With the same rule, curves relating to 10th and 90th centiles are processed by Tanner and Whitehouse's values. Collating between them, curves allow some morphological relief. Moreover, for both referred to the 50th centile of Tanner and Whitehouse curves (for the male sex and the female one), is presented a simple mathematical expression of interpolation, which shows and excellent representation of the measured dates. This expression is composed of a third-degree polynomial (cubic), which is fitted to the dates by the method of least square. The result of the correlation height-weight allows both to synthesize the dates in a sole expression and a simpler relief of discordance in the growth. |
